Siemens Model 771 overview
Siemens Moore Model 771 Current-to-Pneumatic Transducers High signal sensitivity for demanding applications or Simplified design ensures simplified operation Ru...
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Manufactured bySiemens
Product groupCurrent-to-Pneumatic Transducers
DescriptionSiemens Moore Model 771 Current-to-Pneumatic Transducers
Key FeaturesHigh signal sensitivity for demanding applications or Simplified design ensures simplified operation Rugged, NEMA construction, with insensitivity to shock, vibration, and supply pressure variations accommodate operation in harsh industrial environments Choice of output capacities provides application versatility
OverviewThe Models 77 and 771 convert a DC millampere input signal to a pneumatic output signal directly proportional to the input. Their rugged design and ability to withstand shock and vibration allow them to be installed in even the harshest industrial environments. In addition, their exhaust can provide a light purge of the terminal enclosure by plugging the drain hole, making both the Model 77 and Series 771 suitable for use in corrosive environments.Model 77 Current-to-Pneumatic TransducerThe Model 77 Current-to-Pneumatic Transducer, which was designed specifically for measuring circuits, converts the output of an electronic measuring device to a pneumatic signal for indication, recording, computation, or control. It can also be used to convert an electronic controller’s signal to operate a final control element, such as a control valve circuit that requires a high degree of accuracy.The Model 77 is typically used to signal a valve positioner. If it is used for direct-loading of valve actuators or other large volumes, a volume booster relay is required to minimize time lags and the effects of leakage.Model 771 Current-to-Pneumatic TransducersThe Model 771 Current-to-Pneumatic Transducers were designed as a cost-effective valve service current-to-pneumatic transducer.The Model 771 receives the output of an electronic signal, such as a PID control function, and drives a control valve via the transducer until the control function is satisfied. For measuring circuits, or for control circuits requiring a higher degree of transducing accuracy, the Model 77 should be used.Because it’s boosted output capacity minimizes time lags and the effects of leakage, the Model 771B should be used for direct-loading of valve actuators or other large volumes. If the valve actuator includes a valve positioner, a Model 771S should be used.
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Current-to-Pneumatic Transducers
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